Like, games that you have played through multiple times, but you still like to replay them from time to time because you can just relax and have a good time without too much hassle.
For me some are Dark Souls 1&2 and Borderlands 1, I can play them without too much thoughts about what I’m doing, but still be focused enough so no bad thoughts appear.
Unmodded the AI in Civ is pretty bad. On lower difficulties you can have a good time just doing your own thing if that is what you want, just building cities and infrastructure and whatnot. If you’re interested you shouldn’t be intimidated by them, I’d say. Plus you can regularly pick up Civ for like 2-3 bucks these days.